﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
using System.IO.Compression;
using System.Security.Cryptography.X509Certificates;
using System.Net.Security;
using System.Linq;
using System.Net.Cache;

namespace RX.Http
{ 
/// <summary>  
/// Http连接操作帮助类  
/// </summary>  
public class Http
{
    #region 预定义方变量  
    //默认的编码  
    private Encoding encoding = Encoding.Default;
    //Post数据编码  
    private Encoding postencoding = Encoding.Default;
    //HttpWebRequest对象用来发起请求  
    private HttpWebRequest request = null;
    //获取影响流的数据对象  
    private HttpWebResponse response = null;
    //设置本地的出口ip和端口  
    private IPEndPoint _IPEndPoint = null;
    #endregion

    #region Public  

    /// <summary>  
    /// 根据相传入的数据，得到相应页面数据  
    /// </summary>  
    /// <param name="item">参数类对象</param>  
    /// <returns>返回HttpResult类型</returns>  
    public HttpResult GetHtml(HttpItem item)
    {
        //返回参数  
        HttpResult result = new HttpResult();
        try
        {
            //准备参数  
            SetRequest(item);
        }
        catch (Exception ex)
        {
            //配置参数时出错  
            return new HttpResult() { Cookie = string.Empty, Header = null, Html = ex.Message, StatusDescription = "配置参数时出错：" + ex.Message };
        }
        try
        {
            //请求数据  
            using (response = (HttpWebResponse)request.GetResponse())
            {
                GetData(item, result);
            }
        }
        catch (WebException ex)
        {
            if (ex.Response != null)
            {
                using (response = (HttpWebResponse)ex.Response)
                {
                    GetData(item, result);
                }
            }
            else
            {
                result.Html = ex.Message;
            }
        }
        catch (Exception ex)
        {
            result.Html = ex.Message;
        }
        if (item.IsToLower) result.Html = result.Html.ToLower();
        return result;
    }
    #endregion

    #region GetData  

    /// <summary>  
    /// 获取数据的并解析的方法  
    /// </summary>  
    /// <param name="item"></param>  
    /// <param name="result"></param>  
    private void GetData(HttpItem item, HttpResult result)
    {
        if (response == null)
        {
            return;
        }
        #region base  
        //获取StatusCode  
        result.StatusCode = response.StatusCode;
        //获取StatusDescription  
        result.StatusDescription = response.StatusDescription;
        //获取Headers  
        result.Header = response.Headers;
        //获取最后访问的URl  
        result.ResponseUri = response.ResponseUri.ToString();
        //获取CookieCollection  
        if (response.Cookies != null) result.CookieCollection = response.Cookies;
        //获取set-cookie  
        if (response.Headers["set-cookie"] != null) result.Cookie = response.Headers["set-cookie"];
        #endregion

        #region byte  
        //处理网页Byte  
        byte[] ResponseByte = GetByte();
        #endregion

        #region Html  
        if (ResponseByte != null && ResponseByte.Length > 0)
        {
            //设置编码  
            SetEncoding(item, result, ResponseByte);
            //得到返回的HTML  
            result.Html = encoding.GetString(ResponseByte);
        }
        else
        {
            //没有返回任何Html代码  
            result.Html = string.Empty;
        }
        #endregion
    }
    /// <summary>  
    /// 设置编码  
    /// </summary>  
    /// <param name="item">HttpItem</param>  
    /// <param name="result">HttpResult</param>  
    /// <param name="ResponseByte">byte[]</param>  
    private void SetEncoding(HttpItem item, HttpResult result, byte[] ResponseByte)
    {
        //是否返回Byte类型数据  
        if (item.ResultType == ResultType.Byte) result.ResultByte = ResponseByte;
        //从这里开始我们要无视编码了  
        if (encoding == null)
        {
            Match meta = Regex.Match(Encoding.Default.GetString(ResponseByte), "<meta[^<]*charset=([^<]*)[\"']", RegexOptions.IgnoreCase);
            string c = string.Empty;
            if (meta != null && meta.Groups.Count > 0)
            {
                c = meta.Groups[1].Value.ToLower().Trim();
            }
            if (c.Length > 2)
            {
                try
                {
                    encoding = Encoding.GetEncoding(c.Replace("\"", string.Empty).Replace("'", "").Replace(";", "").Replace("iso-8859-1", "gbk").Trim());
                }
                catch
                {
                    if (string.IsNullOrEmpty(response.CharacterSet))
                    {
                        encoding = Encoding.UTF8;
                    }
                    else
                    {
                        encoding = Encoding.GetEncoding(response.CharacterSet);
                    }
                }
            }
            else
            {
                if (string.IsNullOrEmpty(response.CharacterSet))
                {
                    encoding = Encoding.UTF8;
                }
                else
                {
                    encoding = Encoding.GetEncoding(response.CharacterSet);
                }
            }
        }
    }
    /// <summary>  
    /// 提取网页Byte  
    /// </summary>  
    /// <returns></returns>  
    private byte[] GetByte()
    {
        byte[] ResponseByte = null;
        using (MemoryStream _stream = new MemoryStream())
        {
            //GZIIP处理  
            if (response.ContentEncoding != null && response.ContentEncoding.Equals("gzip", StringComparison.InvariantCultureIgnoreCase))
            {
                //开始读取流并设置编码方式  
                new GZipStream(response.GetResponseStream(), CompressionMode.Decompress).CopyTo(_stream, 10240);
            }
            else
            {
                //开始读取流并设置编码方式  
                response.GetResponseStream().CopyTo(_stream, 10240);
            }
            //获取Byte  
            ResponseByte = _stream.ToArray();
        }
        return ResponseByte;
    }


    #endregion

    #region SetRequest  

    /// <summary>  
    /// 为请求准备参数  
    /// </summary>  
    ///<param name="item">参数列表</param>  
    private void SetRequest(HttpItem item)
    {

        // 验证证书  
        SetCer(item);
        if (item.IPEndPoint != null)
        {
            _IPEndPoint = item.IPEndPoint;
            //设置本地的出口ip和端口  
            request.ServicePoint.BindIPEndPointDelegate = new BindIPEndPoint(BindIPEndPointCallback);
        }
        //设置Header参数  
        if (item.Header != null && item.Header.Count > 0)
            foreach (string key in item.Header.AllKeys)
            {
                request.Headers.Add(key, item.Header[key]);
            }
        // 设置代理  
        SetProxy(item);
        if (item.ProtocolVersion != null) request.ProtocolVersion = item.ProtocolVersion;
        request.ServicePoint.Expect100Continue = item.Expect100Continue;
        //请求方式Get或者Post  
        request.Method = item.Method;
        request.Timeout = item.Timeout;
        request.KeepAlive = item.KeepAlive;
        request.ReadWriteTimeout = item.ReadWriteTimeout;
        if (!string.IsNullOrEmpty(item.Host))
        {
            request.Host = item.Host;
        }
        if (item.IfModifiedSince != null) request.IfModifiedSince = Convert.ToDateTime(item.IfModifiedSince);
        //Accept  
        request.Accept = item.Accept;
        //ContentType返回类型  
        request.ContentType = item.ContentType;
        //UserAgent客户端的访问类型，包括浏览器版本和操作系统信息  
        request.UserAgent = item.UserAgent;
        // 编码  
        encoding = item.Encoding;
        //设置安全凭证  
        request.Credentials = item.ICredentials;
        //设置Cookie  
        SetCookie(item);
        //来源地址  
        request.Referer = item.Referer;
        //是否执行跳转功能  
        request.AllowAutoRedirect = item.Allowautoredirect;
        if (item.MaximumAutomaticRedirections > 0)
        {
            request.MaximumAutomaticRedirections = item.MaximumAutomaticRedirections;
        }
        //设置Post数据  
        SetPostData(item);
        //设置最大连接  
        if (item.Connectionlimit > 0) request.ServicePoint.ConnectionLimit = item.Connectionlimit;
    }
    /// <summary>  
    /// 设置证书  
    /// </summary>  
    /// <param name="item"></param>  
    private void SetCer(HttpItem item)
    {
        if (!string.IsNullOrWhiteSpace(item.CerPath))
        {
            //这一句一定要写在创建连接的前面。使用回调的方法进行证书验证。  
            ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);
            //初始化对像，并设置请求的URL地址  
            request = (HttpWebRequest)WebRequest.Create(item.URL);
            SetCerList(item);
            //将证书添加到请求里  
            request.ClientCertificates.Add(new X509Certificate(item.CerPath));
        }
        else
        {
            //初始化对像，并设置请求的URL地址  
            request = (HttpWebRequest)WebRequest.Create(item.URL);
            SetCerList(item);
        }
    }
    /// <summary>  
    /// 设置多个证书  
    /// </summary>  
    /// <param name="item"></param>  
    private void SetCerList(HttpItem item)
    {
        if (item.ClentCertificates != null && item.ClentCertificates.Count > 0)
        {
            foreach (X509Certificate c in item.ClentCertificates)
            {
                request.ClientCertificates.Add(c);
            }
        }
    }
    /// <summary>  
    /// 设置Cookie  
    /// </summary>  
    /// <param name="item">Http参数</param>  
    private void SetCookie(HttpItem item)
    {
        if (!string.IsNullOrEmpty(item.Cookie)) request.Headers[HttpRequestHeader.Cookie] = item.Cookie;
        //设置CookieCollection  
        if (item.ResultCookieType == ResultCookieType.CookieCollection)
        {
            request.CookieContainer = new CookieContainer();
            if (item.CookieCollection != null && item.CookieCollection.Count > 0)
                request.CookieContainer.Add(item.CookieCollection);
        }
    }
    /// <summary>  
    /// 设置Post数据  
    /// </summary>  
    /// <param name="item">Http参数</param>  
    private void SetPostData(HttpItem item)
    {
        //验证在得到结果时是否有传入数据  
        if (!request.Method.Trim().ToLower().Contains("get"))
        {
            if (item.PostEncoding != null)
            {
                postencoding = item.PostEncoding;
            }
            byte[] buffer = null;
            //写入Byte类型  
            if (item.PostDataType == PostDataType.Byte && item.PostdataByte != null && item.PostdataByte.Length > 0)
            {
                //验证在得到结果时是否有传入数据  
                buffer = item.PostdataByte;
            }//写入文件  
            else if (item.PostDataType == PostDataType.FilePath && !string.IsNullOrWhiteSpace(item.Postdata))
            {
                StreamReader r = new StreamReader(item.Postdata, postencoding);
                buffer = postencoding.GetBytes(r.ReadToEnd());
                r.Close();
            } //写入字符串  
            else if (!string.IsNullOrWhiteSpace(item.Postdata))
            {
                buffer = postencoding.GetBytes(item.Postdata);
            }
            if (buffer != null)
            {
                request.ContentLength = buffer.Length;
                request.GetRequestStream().Write(buffer, 0, buffer.Length);
            }
        }
    }
    /// <summary>  
    /// 设置代理  
    /// </summary>  
    /// <param name="item">参数对象</param>  
    private void SetProxy(HttpItem item)
    {
        bool isIeProxy = false;
        if (!string.IsNullOrWhiteSpace(item.ProxyIp))
        {
            isIeProxy = item.ProxyIp.ToLower().Contains("ieproxy");
        }
        if (!string.IsNullOrWhiteSpace(item.ProxyIp) && !isIeProxy)
        {
            //设置代理服务器  
            if (item.ProxyIp.Contains(":"))
            {
                string[] plist = item.ProxyIp.Split(':');
                WebProxy myProxy = new WebProxy(plist[0].Trim(), Convert.ToInt32(plist[1].Trim()));
                //建议连接  
                myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
                //给当前请求对象  
                request.Proxy = myProxy;
            }
            else
            {
                WebProxy myProxy = new WebProxy(item.ProxyIp, false);
                //建议连接  
                myProxy.Credentials = new NetworkCredential(item.ProxyUserName, item.ProxyPwd);
                //给当前请求对象  
                request.Proxy = myProxy;
            }
        }
        else if (isIeProxy)
        {
            //设置为IE代理  
        }
        else
        {
            request.Proxy = item.WebProxy;
        }
    }


    #endregion

    #region private main  
    /// <summary>  
    /// 回调验证证书问题  
    /// </summary>  
    /// <param name="sender">流对象</param>  
    /// <param name="certificate">证书</param>  
    /// <param name="chain">X509Chain</param>  
    /// <param name="errors">SslPolicyErrors</param>  
    /// <returns>bool</returns>  
    private bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors) { return true; }

    /// <summary>  
    /// 通过设置这个属性，可以在发出连接的时候绑定客户端发出连接所使用的IP地址。   
    /// </summary>  
    /// <param name="servicePoint"></param>  
    /// <param name="remoteEndPoint"></param>  
    /// <param name="retryCount"></param>  
    /// <returns></returns>  
    private IPEndPoint BindIPEndPointCallback(ServicePoint servicePoint, IPEndPoint remoteEndPoint, int retryCount)
    {
        return _IPEndPoint;//端口号  
    }
    #endregion
}

#region public calss  
/// <summary>  
/// Http请求参考类  
/// </summary>  
public class HttpItem
{
    /// <summary>  
    /// 请求URL必须填写  
    /// </summary>  
    public string URL { get; set; }
    string _Method = "GET";
    /// <summary>  
    /// 请求方式默认为GET方式,当为POST方式时必须设置Postdata的值  
    /// </summary>  
    public string Method
    {
        get { return _Method; }
        set { _Method = value; }
    }
    int _Timeout = 100000;
    /// <summary>  
    /// 默认请求超时时间  
    /// </summary>  
    public int Timeout
    {
        get { return _Timeout; }
        set { _Timeout = value; }
    }
    int _ReadWriteTimeout = 30000;
    /// <summary>  
    /// 默认写入Post数据超时间  
    /// </summary>  
    public int ReadWriteTimeout
    {
        get { return _ReadWriteTimeout; }
        set { _ReadWriteTimeout = value; }
    }
    /// <summary>  
    /// 设置Host的标头信息  
    /// </summary>  
    public string Host { get; set; }
    Boolean _KeepAlive = true;
    /// <summary>  
    ///  获取或设置一个值，该值指示是否与 Internet 资源建立持久性连接默认为true。  
    /// </summary>  
    public Boolean KeepAlive
    {
        get { return _KeepAlive; }
        set { _KeepAlive = value; }
    }
    string _Accept = "text/html, application/xhtml+xml, */*";
    /// <summary>  
    /// 请求标头值 默认为text/html, application/xhtml+xml, */*  
    /// </summary>  
    public string Accept
    {
        get { return _Accept; }
        set { _Accept = value; }
    }
    string _ContentType = "text/html";
    /// <summary>  
    /// 请求返回类型默认 text/html  
    /// </summary>  
    public string ContentType
    {
        get { return _ContentType; }
        set { _ContentType = value; }
    }
    string _UserAgent = "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)";
    /// <summary>  
    /// 客户端访问信息默认Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)  
    /// </summary>  
    public string UserAgent
    {
        get { return _UserAgent; }
        set { _UserAgent = value; }
    }
    /// <summary>  
    /// 返回数据编码默认为NUll,可以自动识别,一般为utf-8,gbk,gb2312  
    /// </summary>  
    public Encoding Encoding { get; set; }
    private PostDataType _PostDataType = PostDataType.String;
    /// <summary>  
    /// Post的数据类型  
    /// </summary>  
    public PostDataType PostDataType
    {
        get { return _PostDataType; }
        set { _PostDataType = value; }
    }
    /// <summary>  
    /// Post请求时要发送的字符串Post数据  
    /// </summary>  
    public string Postdata { get; set; }
    /// <summary>  
    /// Post请求时要发送的Byte类型的Post数据  
    /// </summary>  
    public byte[] PostdataByte { get; set; }
    /// <summary>  
    /// Cookie对象集合  
    /// </summary>  
    public CookieCollection CookieCollection { get; set; }
    /// <summary>  
    /// 请求时的Cookie  
    /// </summary>  
    public string Cookie { get; set; }
    /// <summary>  
    /// 来源地址，上次访问地址  
    /// </summary>  
    public string Referer { get; set; }
    /// <summary>  
    /// 证书绝对路径  
    /// </summary>  
    public string CerPath { get; set; }
    /// <summary>  
    /// 设置代理对象，不想使用IE默认配置就设置为Null，而且不要设置ProxyIp  
    /// </summary>  
    public WebProxy WebProxy { get; set; }
    private Boolean isToLower = false;
    /// <summary>  
    /// 是否设置为全文小写，默认为不转化  
    /// </summary>  
    public Boolean IsToLower
    {
        get { return isToLower; }
        set { isToLower = value; }
    }
    private Boolean allowautoredirect = false;
    /// <summary>  
    /// 支持跳转页面，查询结果将是跳转后的页面，默认是不跳转  
    /// </summary>  
    public Boolean Allowautoredirect
    {
        get { return allowautoredirect; }
        set { allowautoredirect = value; }
    }
    private int connectionlimit = 1024;
    /// <summary>  
    /// 最大连接数  
    /// </summary>  
    public int Connectionlimit
    {
        get { return connectionlimit; }
        set { connectionlimit = value; }
    }
    /// <summary>  
    /// 代理Proxy 服务器用户名  
    /// </summary>  
    public string ProxyUserName { get; set; }
    /// <summary>  
    /// 代理 服务器密码  
    /// </summary>  
    public string ProxyPwd { get; set; }
    /// <summary>  
    /// 代理 服务IP,如果要使用IE代理就设置为ieproxy  
    /// </summary>  
    public string ProxyIp { get; set; }
    private ResultType resulttype = ResultType.String;
    /// <summary>  
    /// 设置返回类型String和Byte  
    /// </summary>  
    public ResultType ResultType
    {
        get { return resulttype; }
        set { resulttype = value; }
    }
    private WebHeaderCollection header = new WebHeaderCollection();
    /// <summary>  
    /// header对象  
    /// </summary>  
    public WebHeaderCollection Header
    {
        get { return header; }
        set { header = value; }
    }
    /// <summary>  
    //     获取或设置用于请求的 HTTP 版本。返回结果:用于请求的 HTTP 版本。默认为 System.Net.HttpVersion.Version11。  
    /// </summary>  
    public Version ProtocolVersion { get; set; }
    private Boolean _expect100continue = false;
    /// <summary>  
    ///  获取或设置一个 System.Boolean 值，该值确定是否使用 100-Continue 行为。如果 POST 请求需要 100-Continue 响应，则为 true；否则为 false。默认值为 true。  
    /// </summary>  
    public Boolean Expect100Continue
    {
        get { return _expect100continue; }
        set { _expect100continue = value; }
    }
    /// <summary>  
    /// 设置509证书集合  
    /// </summary>  
    public X509CertificateCollection ClentCertificates { get; set; }
    /// <summary>  
    /// 设置或获取Post参数编码,默认的为Default编码  
    /// </summary>  
    public Encoding PostEncoding { get; set; }
    private ResultCookieType _ResultCookieType = ResultCookieType.String;
    /// <summary>  
    /// Cookie返回类型,默认的是只返回字符串类型  
    /// </summary>  
    public ResultCookieType ResultCookieType
    {
        get { return _ResultCookieType; }
        set { _ResultCookieType = value; }
    }
    private ICredentials _ICredentials = CredentialCache.DefaultCredentials;
    /// <summary>  
    /// 获取或设置请求的身份验证信息。  
    /// </summary>  
    public ICredentials ICredentials
    {
        get { return _ICredentials; }
        set { _ICredentials = value; }
    }
    /// <summary>  
    /// 设置请求将跟随的重定向的最大数目  
    /// </summary>  
    public int MaximumAutomaticRedirections { get; set; }
    private DateTime? _IfModifiedSince = null;
    /// <summary>  
    /// 获取和设置IfModifiedSince，默认为当前日期和时间  
    /// </summary>  
    public DateTime? IfModifiedSince
    {
        get { return _IfModifiedSince; }
        set { _IfModifiedSince = value; }
    }
    #region ip-port  
    private IPEndPoint _IPEndPoint = null;
    /// <summary>  
    /// 设置本地的出口ip和端口  
    /// </summary>]  
    /// <example>  
    ///item.IPEndPoint = new IPEndPoint(IPAddress.Parse("192.168.1.1"),80);  
    /// </example>  
    public IPEndPoint IPEndPoint
    {
        get { return _IPEndPoint; }
        set { _IPEndPoint = value; }
    }
    #endregion
}
/// <summary>  
/// Http返回参数类  
/// </summary>  
public class HttpResult
{
    /// <summary>  
    /// Http请求返回的Cookie  
    /// </summary>  
    public string Cookie { get; set; }
    /// <summary>  
    /// Cookie对象集合  
    /// </summary>  
    public CookieCollection CookieCollection { get; set; }
    private string _html = string.Empty;
    /// <summary>  
    /// 返回的String类型数据 只有ResultType.String时才返回数据，其它情况为空  
    /// </summary>  
    public string Html
    {
        get { return _html; }
        set { _html = value; }
    }
    /// <summary>  
    /// 返回的Byte数组 只有ResultType.Byte时才返回数据，其它情况为空  
    /// </summary>  
    public byte[] ResultByte { get; set; }
    /// <summary>  
    /// header对象  
    /// </summary>  
    public WebHeaderCollection Header { get; set; }
    /// <summary>  
    /// 返回状态说明  
    /// </summary>  
    public string StatusDescription { get; set; }
    /// <summary>  
    /// 返回状态码,默认为OK  
    /// </summary>  
    public HttpStatusCode StatusCode { get; set; }
    /// <summary>  
    /// 最后访问的URl  
    /// </summary>  
    public string ResponseUri { get; set; }
    /// <summary>  
    /// 获取重定向的URl  
    /// </summary>  
    public string RedirectUrl
    {
        get
        {
            try
            {
                if (Header != null && Header.Count > 0)
                {
                    if (Header.AllKeys.Any(k => k.ToLower().Contains("location")))
                    {
                        string baseurl = Header["location"].ToString().Trim();
                        string locationurl = baseurl.ToLower();
                        if (!string.IsNullOrEmpty(locationurl))
                        {
                            bool b = locationurl.StartsWith("http://") || locationurl.StartsWith("https://");
                            if (!b)
                            {
                                baseurl = new Uri(new Uri(ResponseUri), baseurl).AbsoluteUri;
                            }
                        }
                        return baseurl;
                    }
                }
            }
            catch { }
            return string.Empty;
        }
    }
}
/// <summary>  
/// 返回类型  
/// </summary>  
public enum ResultType
{
    /// <summary>  
    /// 表示只返回字符串 只有Html有数据  
    /// </summary>  
    String,
    /// <summary>  
    /// 表示返回字符串和字节流 ResultByte和Html都有数据返回  
    /// </summary>  
    Byte
}
/// <summary>  
/// Post的数据格式默认为string  
/// </summary>  
public enum PostDataType
{
    /// <summary>  
    /// 字符串类型，这时编码Encoding可不设置  
    /// </summary>  
    String,
    /// <summary>  
    /// Byte类型，需要设置PostdataByte参数的值编码Encoding可设置为空  
    /// </summary>  
    Byte,
    /// <summary>  
    /// 传文件，Postdata必须设置为文件的绝对路径，必须设置Encoding的值  
    /// </summary>  
    FilePath
}
/// <summary>  
/// Cookie返回类型  
/// </summary>  
public enum ResultCookieType
{
    /// <summary>  
    /// 只返回字符串类型的Cookie  
    /// </summary>  
    String,
    /// <summary>  
    /// CookieCollection格式的Cookie集合同时也返回String类型的cookie  
    /// </summary>  
    CookieCollection
}  
    #endregion  
}  